<template>
    <div>
    <!-- 面包屑导肮区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
        <!-- 添加角色 -->
        <el-row>
            <el-col>
                <el-button type="primary">添加角色</el-button>
            </el-col>
        </el-row>
        <!-- 角色列表区域 -->
        <el-table :data="roleList" border stripe>
            <el-table-column type="expand">
                <template v-slot="scope">
                    <el-row :class="['bdbottom',i1 === 0 ? 'bdtop' : '','vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightsById(scope.row,item1.id)">
                                {{item1.authName}}
                            </el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级和三级权限 -->
                        <el-col :span="19">
                            <!-- 通过for循环嵌套渲染二级权限 -->
                            <el-row :class="[i2 === 0 ? '' : 'bdtop','vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                                <el-col :span="4">
                                    <el-tag type="success" closable @close="removeRightsById(scope.row,item2.id)">
                                        {{item2.authName}}
                                    </el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <el-row :span="20">
                                    <el-tag type="warning" v-for="item3 in item2.children" :key="item3.id" closable @close="removeRightsById(scope.row,item3.id)">
                                        {{item3.authName}}
                                    </el-tag>
                                </el-row>
                            </el-row>
                        </el-col>
                    </el-row>
                </template>
            </el-table-column>
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="285">
                <template v-slot="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                    <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRinghtDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-card>
    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="30%" @close="setRightDialogClosed">
        <el-tree :data="rightsList" :props="treeProps" ref="treeRef" show-checkbox node-key="id" :default-expand-all="true" :default-checked-keys="defKeys"></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allRights">确 定</el-button>
        </span>
    </el-dialog>
    </div>
</template>
<script>
export default {
    data() {
        return {
            //所有角色列表数据
            roleList:[],
            //控制分配权限的对话框的显示与隐藏
            setRightDialogVisible:false,
            //所有的权限数据
            rightsList:[],
            //树形控件的属性绑定
            treeProps:{
                label:'authName',
                children:'children'
            },
            //默认选中的节点id数组
            defKeys:[],
            //当前即将分配权限的id
            roleId:''
        }
    },
    created() {
        this.getRolesList()
    },
    methods:{
        //获取所有角色的列表
        async getRolesList(){
            const {data:res} = await this.$http.get('roles')

            if(res.meta.status !== 200){
                return this.$message.error('获取角色列表失败！')
            }

            this.roleList = res.data
            console.log(this.roleList)
        },
        removeRightsById(role,rightId){
            //弹框提示用户是否删除
            this.$confirm("此操作将永久删除该标签, 是否继续?", "提示", {
            confirmButtonText: "确定",
            cancelButtonText: "取消",
            type: "warning"
        })
        .then(async ()=> {
            const {data:res} =  await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status !== 200) {
                return this.$message.error('删除用户失败!')
            }

            this.$message({
                type: "success",
                message: "删除成功!"
            });
            // 不直接调用权限列表，而是将删除后的数据直接赋值给当前角色的children，可以防止删除之后table合起来，影响用户体验
            role.children = res.data;
            // this.getRolesList()
        })
        .catch(() => {
                this.$message({
                type: "info",
                message: "已取消删除"
            });
        });
        },
        async showSetRinghtDialog(role){
            this.roleId = role.id;
            //获取所有的权限数据
            const {data:res} = await this.$http.get('rights/tree')

            if(res.meta.status !== 200){
                return this.$message.error('获取权限数据失败！')
            }
            this.rightsList = res.data;

            //递归获取三级节点的id
            this.getLeafKeys(role,this.defKeys)

            this.setRightDialogVisible = true
        },
        //通过递归的形式，获取角色下的所有三级权限的id，并保存在defKeys数组中
        getLeafKeys(node,arr){
            //如果当前node节点不包含children，则是三级节点
            if(!node.children){
                return arr.push(node.id)
            }
            node.children.forEach(item => {
                this.getLeafKeys(item,arr)
            });
        },
        //监听分配权限对话框的关闭事件
        setRightDialogClosed(){
            this.defKeys = []
        },
        //点击为角色分配权限
        async allRights(){
            const keys = [
                ...this.$refs.treeRef.getCheckedKeys(),...this.$refs.treeRef.getHalfCheckedKeys()
                ];
            const idStr = keys.join(',');
            const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idStr})

            if(res.meta.status !== 200){
                return this.$message.error('分配权限失败')
            }
            this.$message.success('分配权限成功')
            this.setRightDialogVisible = false
            this.getRolesList()
        }
    }
}
</script>
<style lang="less" scoped>
.el-tag{
    margin: 10px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}
</style>